166656065555 has 24 divisors (see below), whose sum is σ = 234941646960. Its totient is φ = 113146958400.

The previous prime is 166656065501. The next prime is 166656065579. The reversal of 166656065555 is 555560656661.

It is not a de Polignac number, because 166656065555 - 2¹² = 166656061459 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166656065555.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3342725 + ... + 3392214.

It is an arithmetic number, because the mean of its divisors is an integer number (9789235290).

Almost surely, 2^166656065555 is an apocalyptic number.

166656065555 is a deficient number, since it is larger than the sum of its proper divisors (68285581405).

166656065555 is a wasteful number, since it uses less digits than its factorization.

166656065555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6735059 (or 6735052 counting only the distinct ones).

The product of its (nonzero) digits is 24300000, while the sum is 56.

The spelling of 166656065555 in words is "one hundred sixty-six billion, six hundred fifty-six million, sixty-five thousand, five hundred fifty-five".